This isn't an either/or situation, both are at fault here. The artists who put out such clearly shoddy work, I mean, show some damn professional pride for crying out loud! and the company for not only allowing so many sketches from any artist, but for approving them for pack insertion. There is no way these cards should have passed quality control. What makes it even worse is that all those artists kept getting hired for other sets by TOPPS.
This kind of thing is just 1 of the reasons I gave up collecting sketches and buying any boxes/cases of sketch based sets, my collection now consists of exactly 2 sketches.

the artist just do their job.. they get paid a certian amount to put out certain quality. quality control? yah but if one of these artist were famous as picasso you would care i bet. stop supporting these companies if you dont like what they are doing